Uncoated, Silicon Window

Description

Product Specification:

• Bevel: Protective as needed
• Clear Aperture CA (mm): –
• Clear Aperture (%): 90.00
• Thickness (mm):  ±0.1
• Diameter (mm):  +0.0/-0.1
• Coating: Uncoated
• Coefficient of Thermal Expansion CTE (10⁻⁶/°C): 2.55
• Density (g/cm³): 2.33
• Index of Refraction n_d: 3.422 @ 5µm
• Parallelism (arcmin): <3
• Edges: Fine Ground
• Knoop Hardness (kg/mm²): 1150
• Poisson’s Ratio: 0.265
• Substrate: Silicon (Si)
• Surface Flatness (P-V): 1λ
• Surface Quality: 60-40
• Type: Protective Window
• Wavelength Range (nm): 1200 – 7000
• Young’s Modulus (GPa): 140

For further assistance with customization or to place an order, please visit our online store or contact our sales team.

Material and Optical Properties:

1. Mechanical Properties:
   • Knoop Hardness: 1150, making silicon harder and less brittle than Germanium, thus providing enhanced durability and resistance to mechanical stress.
2. Transmission Properties:
   • Broad Transmission: Effective transmission from 1.2 µm to 7 µm, covering both NIR and MWIR regions.
   • Enhanced Performance: The AR coating for 1.65 – 5 µm improves transmission efficiency and reduces surface reflections, crucial for high-performance IR systems.
3. Cost and Availability:
   • Low Cost: Silicon windows are cost-effective compared to other IR materials like Germanium and Zinc Selenide, making them popular for a variety of applications.
   • Versatile Sizing: Available in diameters ranging from 10 mm to 76.20 mm, accommodating different application needs.

Applications:

1. Infrared Imaging:
   • NIR and MWIR Imaging: Perfect for applications requiring high transmission in the 1.2 – 7 µm range, such as thermal imaging cameras and IR sensors.
   • AR Coated Systems: Enhanced performance in the 1.65 – 5 µm range for critical imaging and sensing applications.
2. Industrial Sensing:
   • Weight-Sensitive Devices: Ideal for portable or airborne IR sensing equipment where minimizing weight is crucial.
   • Environmental Monitoring: Used in sensors for environmental monitoring requiring durable and lightweight optical components.
3. Aerospace and Defense:
   • Surveillance and Reconnaissance: Suitable for aerospace and defense applications, providing reliable performance in weight-sensitive and harsh environments.
   • Thermal Imaging Systems: Utilized in systems operating within the 1.65 – 5 µm range, especially those requiring enhanced transmission and durability.
4. Scientific Research:
   • Spectroscopy: Applied in spectroscopic instruments needing broad IR transmission and durable optics.
   • General Research: Ideal for experiments and applications requiring robust and cost-effective IR window solutions.

SHAPEOPTICS Silicon (Si) Windows offer a cost-effective and versatile solution for a wide range of infrared applications, particularly in the NIR and MWIR regions. Their low density and high hardness make them suitable for weight-sensitive and durable applications, respectively. With options for uncoated and AR-coated windows, these silicon optics provide enhanced performance and reliability, making them a preferred choice for industrial, aerospace, defense, and scientific applications.